Regulating mechanism



Jan. l0, 1928. 1,655,682

R. G. STANDERWICK REGULATING MECHANISM FOR ELASTIC FLUID TURBINES Filed April 23. 1926 b MW g His Attorney.

Jan. l0, 1928. -`1,655,682

R. G. STANDERWICK REGULATING MECHANISM FOR ELASTIC FLUID TURBINS Filed April 23. 1926 2 Sheets-Sheet 2 /221 la' sa E f/ f' I n ITweTwtQ: Reginald G1. Standevwck, bg l His Attorney Patented Jan. l0, 1928.

maar

UNITE STTES PTENTVFVFICE.

REGNLID STANDERWICK, 0F MARBLEHEAD, MASSACHUSETTS, ASSIGNOR T0 GEN- ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK. l

REGULATING MECHANISM .FOB ELASTIC FLUID TURBINES.

Application filed April 23, 1926. Serial No. 104,234.

The present invention relates to regulating mechanism for elastic fluid turbines and has for its object to provide an improved structure and arrangement in a mechanism of this character. v Y

The invention as tocertain of its features may be embodied in regulating mechanisms for various typesof .turbines vsuch as, for example, mixed pressurevturbines, extraction turbines, turbo-compressor sets, and ythe like. As to certain other features, it is especially adapted to extraction turbines, and I have accordingly specifically illustrated the inven-y tion appliedto an extraction machine.

F or a consideration of what l believe to be vnovel and my invention, attention is directed to the accompanying description and the claims appended thereto.

1n the drawing, `Fig. 1 is a diagrammatic view of a regulating mechanism embodying my invention applied to an extraction turbine; Fig. 2 is a side elevation of a turbine and regulating mechanism; Fig. 3 is an end view thereof; and Figs. 4, 5 and 6 are detail sectional views of certain parts on a larger scale than that of Fig. 1.

Referring to the drawing, 1 indicates an elastic fluid turbine, 2 being the casing or shell of the turbine and 3 the shaft. fluid is supplied to t-he high pressure end of the turbine through a conduit a, and exhausts through a housing 5 to a suitable condenser (not shown). The flow of elastic fluid fromv conduite to the lirst stage nozzles (not shown) is controlled by a primary valve 6 and a group or series of secondary valves 7. Frimary valve 6 controls the flow of elastic fluid through a passage 8 to one group of first stage nozzles and secondary valves 7 control thev flow of elastic fluid from an elastic fluid chest 9 to another group of first stage nozzles.' Valves 6 and 7 are biased toward closed positions by springs 10 and are opened against the biasing action of such springs by a series of pivoted lever arms 11 provided with rollers 12 at their free ends which engage cams 13 on a cam shaft 14.

rlhe arrangement is such that when cam' shaft la turns in one direction valve 6 is first opened after which valves 17 are successively opened. When cam shaft 14 turns in the other direction, valves `7 are successively closed after which valve 6 is closed. f

The general arrangement of the levers for Elastic i is extracted from the turbine.

operating each of the valves 6 and 7 is the same. An outline of the connections for one of the valves 7 is shown in section in Fig. 1.

The stem 15 of the valve projects through a wall 16 which-forms a part of a supporting bracket 17 on which lever 13 is pivoted, and at its upper end extends through an opening in a web 18, which forms a. part of lever 13. On the upper end of stem 15 is arranged a collar 19, which rests on .rounded projections 20 on web 18. Spring 10 is arranged between a collar 21 on a stem 15 and the `under surface `of wall 16. With this arrangement it will bey seen that when the rightfhand end of lever 13 is raised, valve 7 will be opened against the biasing action of spring 10. 0n one end of cam shaft 14 is a pinion 22 with which engages teeth on a rack 23. kRack 23 is fastened on the upper n ,endA of a ste1n 24,.which at its lower end is connected to a piston 25 which moves in a cylinder 26. Piston 25 is biased towards an annular stop 27 in the lower end of cylinder 26 by` a suitable spring means 28. piston 25 moves upward in cylinder 26 it turns cam shaft 14 in aL direction to open valves Gand 7 while when it moves downward it turns shaft 14- ina ydirection to close rvalves 6 and 7 in elastic liuid is taken from an intermediate n stage for industrial `or other purposes. 1n

when i Fig. 1 thek section of the turbine is taken through the extraction stage conduit 29, being the conduit through which elasticfluid The flowof elastic fluid from the extraction stage to the next lower stage is controlled by a ring valve or overllow valve 30, the purpose of this valve being to maintain constant the pressure in the extraction stage. y

The use of a ring valve or overflow valve for this purpose yis well understood in this art, and the same is accordingly illustrated only in outline. A mechanism ot this type is well illustrated in the patent to Fred E. Norton, 1,091,078, patented March 24, 1914.

Ring valve 3() is moved by means ot teeth on a rack 31, which engage similar teeth on a gear segment 32 attached to ring valve 30. Rack 31 is connected by a rod to piston 34, which moves in a cylinder The admission of actuating tluid to cylinder' 35 is controlled by a pilot valve structure Piston 34, cylinder 35 and pilot valve form a usual type ot fluid-actuated motor to be used in positioningring valve 3G. The stem ot pilot valve 3G is pivotally connected to a floating lever 37. The lower end otl lever 37 is pivoted to an arm 38, which in turn is pivoted on a lined bracket 39. The tree end o't` arm 38 is pivotally connected to an extension 40 of rod The upper end of floating lever 37 is pivotally connected to one end ot a bell crank lever 41, which is `lulcrumed on a vbracket 42. Movement of bell crank lever 41 serves to move pilot Valve 36 and thus control the admission ot actuating fluid to cylinder 35 in the well understood manner. Lever arm 38 and extension 40 torni a. usual arrangement ot i'ollow-up connection tor the fluid-actuated motor. The arrangement. of the fluid-actuated motor for operating ring valve 30 is showin only diagrammatically and by way of example, such arrangements being well known in this art.

In the operation ot an extraction turbine, it is desired to maintain the pressure in the extraction stage substantially constant, the pressure being controlled by the ring valve or other valve means which regulates the flow of elastic `fluid from the extraction stage to the next lower stage, as is well` understood. To accomplish this, it is desirable to regulate the admission ot elastic liuid to the turbine and the low ot' elastic fluid from the extraction stage in accordance with both the load on the turbine and the pressure in the extraction stage. lilhen the load on the turbine increases or decreases the valve means regulating the flow ot elastic tluid to the turbine and the valve means regulating the tlow ot elastic fluid from the extraction stage to the next lower sta-ge should be operated both in the same direction or sense, that is, opened andl closedtogether. On the other hand, when the pressure in the extraction stage increases, then it is desirable to open further the valve means controlling the llow ot elastic fluid from the extraction stage to the next lower stage and close further the valve means regulating the flow ot elastic fluid to the turbine, while when the extraction pressure decreases, it is desirable to close somewhat the valve means controlling the flow of elastic fluid from the extraction stage to the next lower stageand open somewhat the valve means regulating the admission of elastic liuid to the turbine. Thus it. will be seen that with changes in load the admission valve mechanism and the overflow valve mechanism are operated in the same direction or sense while with changes in the eX- traction pressure they are operated in opposite directions or in the opposite sense. My improved regulating means, whereby the foregoing result is accomplished will now be described.

Moiuitedon the bearing pedestal 43 at the high pressure end oi` the turbine are two control mechanisms A and B. The correct relative arrangements ot these two mechanisms is shown in Figs. 2 and 3. In Fig. 1 they are illustrated diagrammatically one in advance ot the other, the bearing pedestal 43 being shown twice. Also in Fig. 1, the section through the turbine and the high pressure valvegea-r are not shown in correct relative relation to each other or to the diagraniniatic showing ot bearing pedestal 43, but are arranged in positions so as to clearly illustrate the principle of the invention.

Referring particularly to Figs. 1 and 5, the mechanism A comprises a vertical shaft 44, which is driven by a worm wheel 45, carried by a shaft 45, which in turn is connected to the turbine shait. On the upper end of shaft 44 is a speed governor comprising weight arms 46 and a spring 47, the arrangement being such that as the speed increases and decreases, the weight arms move outward and inward against the action of spring 47 by centrifugal torce. rlhe governor is connected by a yielding connection 48 to a pilot valve member 49. Pilot valve member 49 comprises a tubular sleeve and rotates continuously with the governor. it the same time when weights 46 move, valve member 49 is moved up and down. The governing mechanism is enclosed in a housing 50 on which is mounted a pilot valve casing 51. inside pilot valve casing 51 is a. restoring bushing 52, provided with ports 53 which serve to connect the interior oi'' busl1ing52 to an annular chamber 54 formed between casing 51 and bushing 52. Connected to annular chamber 54 is a pipe 55 through which Huid flows to the chamber. The flow ot tluid from the chamber through passages 53 is controlled by the upper end of pilot valve member 49. Bushing 52 is carried on the lower end of a threaded rod 56. By turning rod'56 and bushing 52 relatively to each other the position ot bushing 52 may be adjusted relatively to pilot valve casing 51. Vrlhis adjustment may be effected either manually by means ont a handwheel 57, or by means ot an electric motor 58. This adjusting arrangement is indicated only diagrammatically as it torins no part of the present invention. lt is indicated as being of the type disclosed and claimed in llo the patent `toPaul H. Scott, No.1,583,610,

64. Bellows 63 and casing- 64 are attached to the underside of a bracket arm 65'provided with a comparatively large central opening 66 which connects the interior of the bellows to atmosphere. The exteriory of bellows 63 is subjected to the pressure in casing 64. Inside bellows 63 is a sleeve 67 which Jforms a stop to limit the movement of bellows 63 in an upward direction. On rod 62is a collar 68 against which bears one end of a spring 69, the other end bea ing against a' block 69a vliXed to sleeve 67. Spring 69 thus acts in a direction to contract bellows 63. l

Referring now to Figs. v1 and 4, mechanism B comprises a pilot valvefcasing 70 provided with ay stationary bushing 71 which denes l with casing 7 0 an annular chamber 72. ln

Ill

bushing 71 are a series of ports. 7 3 which connect chamber 72 to the interior of the bushing. Inside bushing 71 is a tubular ypilot valve member 74 to the lower end ofv which is connected a rod 75. Pilot valve i member 7 4 serves to cover and uncover the ras lthe bellows. The other end of floating lever 76 is connected by a link 81 toene arm 82 of abell crank lever. The otherarm 83 of the bell crank lever is connected by a rod 84 to an eccentric 85 (see F ig. o)lon shaft 14, the rod being provided with an eccentric strap 86 which surrounds the eccentric.y

Arranged adjacent to .theturbine at one side of it or at any other convenient location, is a unitary control mechanism C. ltcom-v prises a pedestal90 (Figs. 2 and 3),v having bottom wall 91 and al top wall` 92. lrl'ounted on the bottom wall 91 is a pressureresponsive'y mechanism l), and mounted on top wall 92 is a mechanism E. The detail structure. of mechanisms l) and E is shown iu Fig. 1. Mechanism 1C is enclosed by a cover 93. v Referring to Fig. 1, the pressure responsive mechanisn'r D comprises a fluid-tight casing 94 in which is arranged a ycorrugated presses the spring.

bellows 95. yThe interior of bellows 95 is open to atmosphere while t-he exterior is subjected tothe pressure in easing 94. Engaging the lower head 96 of bellows 95 is a rod 97. On rod 97 is a spring plate 98 to which is attached one end of a spring 99,

tne other end of the spring being attached to a. spring plug 100 on the top of casing 94. Spring 99. is a tension spring and serves to Voppose the collapsing of bellows 95. The rod 97 `extends upward to the mechanism E andfits upper end engages the under side of a lever 101. Lever 101 is pivoted on the upper end oi a bracket 102. One end or lever 101 is co nected by a link 103 to a pair of arms 104. The outer ends of arm 104 are connected to a pair o arms 105 which in turn are pivoted to each other and to a linl: 106 which serves to connect them to a stationary support 107. The points at which arms 104 and 105 are connected together are joined by a spring 103 kso that when the leftvhand end of lever 101 moves up and down it entends and comrlhe spring thus se ves to oppose upward movement of the lever The purpose of spring 108 is to modify the characteristics of bellows 95 and spring 99. rlhe details of its construction and method of operation are not set forth herein as they form the subject matter of my application, Serial No. 104,235, filed of even date herewith. For the purpose of the present invention, it is necessary only to state that bellows 95, spring 99 and spring 10S all operate, together to provide a pressure responsive construction capable of being moved to effect movement of lever101 by comparatively small changes in the pressure applied to bellows95, and, at the same time, a construction wherein equal changes in the pressure to which bellows 95i is subjected eilect substantially equal movements of the bellows. rlhe construction comprising springr 108 forms what l terman inverted elastic connection. lt has a straight line characteristic and serves lomocify the character istics of the simple elastic connection com prising bellows 95 and spring 99 to the desired extent.

wThe other end of the lever 101' is corr nected by a link 109 to arm 110 or a threearm lever, the other arms of which are indicated at 11i and 112. Arms 111 and 112 vare integral with each other and are connected yto arm 110 by a bolt 112, the boltpassing through an elongated slot 112h in arms 111 and 112. By this arrangement isok the relative lengths'of arms 111 and 1.12 can be adjusted. The three-arm lever is'pivotally mounted by an extension of bolt 112i on one end of a lever 113 pivoted at 114 on bracket 102. The other end of'lever 113 is connected by a rod 115 to a bellows structure comprising an inner bellows 11.6 and an outer lit) bellows 117, suitably connected together at their upper and lower ends and mounted in a fluidstight casing 118. The annular chamber between bellows 116 and 117 is connected by a pipe 119 to fluid-tight casing 64 of the mechanism 1-1 and the interior of casing 118 is connected 'to pipe 55. 119a is a s] ring' which acts in a direction to oppose collapsing of the bellows structure.

The end of lever arm 111 is connected by a rod 126 to a corrugated bellows 121 contained in the fluid-tight casing 122. rEhe interior of bellows 121 is open to atmosphere while the outside of it is subjected to the pressure in casing 122. Casing 122 is connected by a pipe 123 to a fluid-tight casing 124 in which is located a corrugated bellows 125 connected by a rod 26 to one arm of bell crank lever 41. 127 is a sleeve which forms a stop to limit the collapsing movement of bellows 125 and 128 is a spring which opposes collapsingl movement of the bellows. inside of bellows 121 is a stop sleeve 129.

Arm 112 of the three-arm lever is connected by a rod 130 to a corrugated bellows 131 located in a fluid-tight casing The interior of bellows 131 is open to atmosphere while the exterior is subjected to the pressure in casing 132. Inside bellows 131 is a stop sleeve 133.` Casing 132 is conn nected by a pipe 134 to the interior of fiuidtight casing 79 which forms a part of the mechanism B.

The space between bellows 116 and 117, pipe 119, and casing 64; casing 122, pipe 123, and casing 124; and casing 132, Vpipe 134, and casing 79, are in each instance filled completely with a suitable liquid, the arrangements forming in each case an hydraulic means for transmitting movement from one corrugated bellows to the other.

The lower end of vertical shaft 44 drives a suit-able pump 135 located in an oil tank 136. The suction conduit for pump 135 is indicated at 137 and the discharge pipe is indicated at 138. Connected to discharge pipe 138 ,is a branch pipel 139 which leads to a pressure relief Valve 140 in tank 136. Pressure relief valve 140 is set so as to maintain in pipe`138 a substantially constant desired pressure. Pipe 138 supplies oil through an orifice 141 in a plate 142 to a pipe 143, and through an orifice 144 in a plate 145 to pipe 55. Pipe 143 is connected to cylinder 26 Vbeneath piston 25. Extending from pipe 143 is a branch pipe 146 which connects with annular chamber 72 of mechanism B. Since the pressure in pipe 138 is substantially constant, substantially a constant quantity of oil is discharged continuously through orifices 141 and 144 to pipes 143 and 55. 147 indicates a drain pipe for conveying oil bach to tank 136. Extraction conduit 29 is connected to casing 94 by a pipe 148, whereby the corrugated bellows 95 is subjected at all` times to the pressure of the extraction elastic fluid.

The operation is as follows: Assume that the turbine is running under load at the dcsired speed, that elastic fluid is being extracted through conduit 29, and that ring valve is in a position such that the desired pressure obtains in the extraction conduit. Under these circumstances, pump 135 will Vbe supplying oil continuously to orifices 141 and144, and a denite quantity of oil will be flowing through them to pipes 143 and The oil supplied to pipe 143 flows through branch pipe 146 to annular chamber 72 in mechanism B, and from thence it flows over the end of pilot valve member 74 and down through it back to oil tank 136. Pilot valve member 74 is located in a position relatively to annular chamber 7 3 such thata pressure is built up iin pipes 143 and 146, and hence under piston 25, which pressure holds the piston in a position to maintain valves 6 and 7 open to an extent such that sufficient elastic fluid is admitted to the turbine to carry the load and supply the necessary steam for extraction purposes. ri'he oil supplied through orifice 144 to pipe 55 flows to annu-- lar chamber 54 of mechanism A and can escape therefrom through ports 53 and down through pilot valve member 49 back to oil tank 136. With the desired turbine speed obtaining, pilot valve member 49 is positioned to maintain a pressure in pipe 55, and hence in fluid-tight casing 118, such that lever 113 is held in a certain predetermined position due to the action of the oil pressure on the bellows structure comprising bellows 116 and 117. Y

If now for any reason, for example, due to decrease in load, the speed of the turbine increases, then thel weight arms 46 and 47 of the speed governor fiy outward, lowering somewhat pilot valve member 49 relatively to restoring bushing 5 2. This uncovers further the ports 53 permitting oil to escape more rapidly from pipe This lowers somewhat the pressure in pipe with the result that spring 119"L distends the bellows structure comprising bellows 116 and 117, thus turning lever 113 in an anticloclrwise direction on its pivot 114. This lowers the left-hand end of lever 113 and pulls down three-arm lever comprising arms 110, 111, and 112, as a unit. lVhen the three-arm lever moves downward both corrugated bellows 121 and 131 are collapsed somewhat. The collapsing of bellows 121 draws fluid from casing 124 with the result that corrugated bellows 125 is distended somewhat. The distension of bellows 125 operates therough rod 126 to turn bell crank lever 414 on its pivot on bracket 42, and to move the upper end of vertical lever 37 toward the left. This movement of lever 37 moves pilot valve 36 toward the left and eftects a movement of piston 2i to the right andv ina direction to close Vsomewhat the ring valve 30, thereby decreasing the amount 'of elastic fluid which caniiow by the ring,` valveto the subsequent turbine stages. -W hen piston 211 moves to the right it restores pilot valve 3G through they tollen' up connection 38 in the well understood manner. At the same time, the collapsing of corrugated bellows 131 serves to draw duid from casing` 79 ot mechanism B, thereby distending corrugated bellows 78. This lowers the righthand end oit floating lever 76, thereby lowering pilot valve member 74 and uncovering further ports 7 3. This permits oil to escape more rapidly from pipe 146 thereby lowering the pressure under piston'25. Spring 28 thereupon forces piston 25 `downward in a direction to close somewhat the valve mechanism controlling the admission of elastic fluid to the turbine. l/Vhen piston 25 moves downward it turns cam shait 1li with the result that eccentric 85 moves lever 811 in a direction to turn bell cranlrlever arm82 clockwise, which serves to raise pilot valve Vstructure 116 and 117 moves upward it serves to draw liquid from casing 64, thus decreasing the pressure in the casing and effecting a distending `movement of bellows 63. This movement of the bellows lowers the right hand end ot lever 59, thereby moving restoring bushing 52 downward to prevent overtravel oi the governing mechanism.

In case of a decrease in speed of the turbine due to increase in load, for example, then weights 46 and t7 move inward somewhat under the action of the governing' spring thereby raising pilot valve member 49 and increasing the pressure in pipe An action similar to that just described except in the opposite direction thentalres place, the ring valve 30 and the valve mechanism for the turbine being both given anl opening;` movement.

It the pressure in extraction conduit 29 decreases, which indicates 'an increase in the demand tor extraction elastic fluid, the pressure in casing 94 decreases, whereupon bellows 95 is distended. This causes lever 101 to turn on its pivot on bracket 102 in an anticloclrwise direction. As a result link 109 and'lever arm 11() are moved toward the left thereby lowering the outer end ot' lever 111 and raising the outer end of lever 112.

j As will `be clear from the explanation given above, a lowering` of the right hand end of lever'111V results in effecting avmovement of ring valve 3() in a direction to close it somewhat .while the raising ot' the outer end of lever 112 results in an opening movement of the valve mechanism controlling pressure in extraction conduit 29 increases,

which indicates a'decrease in the demand for extraction elastic tluid. then the increased pressure acting on corrugated bellows 95 serves to collapse it somewhat with the result that lever 110 is moved toward the right,

thus raising the outer end ot lever 111, and

lowering the outer end of lever 112. As a result,the amount or elastic fluid admitted to the turbine is decreased, while the ring valve is opened somewhat, permitting` more elastic Huid to flow to the subsequent turbine stages. This serves to decrease the supply or elastic liuid available for extraction purposes and brings the pressure back to nor! mal.

By adjusting leverarms 111and 112 relative to lever arm 110, this being accomplished by reasonot slot 112, the relative relation between theoperation of ring valve r3() and the valve means comprising; valves 6 and 7 when the three-arm lever is turned,

`can be changed. This is a thing ot considerable importance in the practical use ot my invention. lever arms 111 and 112 are moved, the structures comprising' casings 122 and 132 are adjusted along with them; v

Tt will be seen that the two bellows devices `121 and 131 it'orm movable devices through bine (in the present instance, the extraction pressure), and that the operating device comprising bellows 116, 117 responds to another operating condition of the turbine (in the present instance, the speed of the turbine). Furthermore, it will be understood that while T have illustrated the various devices as being' in the form of bellows (this beingthe arrangement I now,l prefer), my invention is by ne means limited thereto, since any other equivalent type of device may be used.

W ith the above-described arrangement it will be seen that the major portion of the control apparatus is carriedcby the pedestal 90. anism, whichunay be placed at any point adjacent to or remote from the turbine, the only connections between it and the mechanism onthe turbine being the piping coni This forms a unitary control mech.

the admission ofelastic 'fluid to the turbine. i

It will be' understood that when 4 necting them. This greatly simplifies `the mechanism to be mounted on the turbine and avoids the necessity of mounting a large number of levers and rods on the turbine. This is of advantage in that it renders the parts more accessible and does away with the possibility of binding of the levers which may be caused for example by uneven eX- pansion of the turbine parts. A control mechanism for a turbine is a comparatively exact piece of apparatus and any binding of the operating parts may cause faulty operation. The arrangement also has the advantages of being compact, of being capable of manufacture at a low cost, and of being reliable in operation. f

In accordance with the provisions of the patent statutes, I have described the principle 0In operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the 'apparatus shown is only illustrative and that the invention may be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. The combination with an elastic fluid turbine, of valve means controlling the flow of elastic fluid to the turbine, a fluid-actuated motor for moving the valve means, a pilot valve for controlling the fluid pressure supplied to said motor, a unitary structur comprising'a movable device and two separate operating devicesy either of which is adapted to eect movement of said movable device, means responsive to the speed of the turbine for effecting movement of one of said operating devices, means responsive to aiiother operating condition of the turbine for effecting movement of the other of said operating devices, and hydraulic means .for transmitting movement from the movable device to said pilot valve.

2. The combination with an elastic fluid turbine, ofvalve means controlling the flow of elastic fluid to the turbine, a fluid-actuated motoi` for moving the valve means, a pilot valve for controlling the fluid pressure supplied to said motor, a unitary struc-- ture comprising a movable device and two separate operating devices either of which is adapted to effect movement of said movable device, means responsive to the speed of the turbine for effecting movement of one of said operating devices, means responsive to another' operating condition of the turbine for effecting movementof the other of said operating devices, hydraulic means for transmitting movement from the movable device to said pilot valve, a follow-up connection for said speed responsive means, and hydraulic means for transmitting movement from saidv one separate device to the follow-up connection.

3. The combination with van elastic fluid valve means for controlling the flow of fluid at an intermediate point in the turbine a fluid-actuated motor including a pilot valve for moving the second valve means, a unitary structure comprising two movable devices. and an operating device adapted to move both said movable devices, means for effecting movement of. said operating device in response to an operating condition of the turbine, and hydraulic means 'for transmitting movement from said movable devices to said pilot valves.

4. The combination with an elastic fluid turbine, of a primary valve means controlling the flow of elastic fluid to the turbine, a fluid-actuated motor for moving the valve means, a pilot valve for controlling the fluid pressure supplied to said motor, a second valve means for controlling the flow of fluid at an intermediate point in the turbine, a fluid-actuated mot-or including a pilot valve for moving the second valve means, a unitary structure comprising two movable devices and two operating devices, each operating device being adapted to move both said movable devices, means for effecting movements of said operating devices in response to operating conditions of the turbine, and hydraulic means for transmitting movement from said movable devices to said pilot valves.

5. The combination with an elastic fluid turbine, of primary valve means controlling the flow of elastic fluid to the turbine` a fluid-actuated motor for moving the valve means, a pilot valve for controlling the fluid pressure supplied 'to said motor, a second valve means for controlling the flow of fluid at an intermediate point in the turbine, a fluid-actuated motor including a pilot valve for moving the second valve means, a unitary structure comprising two movable dec vices and two operating devices, each operating device being adapted to move both said movable devices, a speed governor for effecting movement of one of said operating devices, means for effecting movement of the other of said operating devices in response to another operating conditionof the turbine, and hydraulic means for transmitting movement from said movable devices to said pilot valves. v

6. The combination with an elastic fluid turbine, of valve means controlling the flow of elastic fluid to the turbine, a fluid-actuated motor for moving the valve means, a pilot valve for said motor, a speed governor, a pilot valve connected to the speed governor, a movable device, an operating device for moving it, an hydraulic operating conloo lll)

nect'ion between said movable device and said first-named pilot valve, and fluid pressure means for said operating device controlled by said second-named pilot valve.

T. The combination with au elastic fluid,

turbine, oit a valve means controlling` the (low ot elastic fluid to thc turbine, alluidactuated motor for movingthe valve means, a pilot valve tor lsai d motor, speed governor, a pilot valve connected to the speed governor, a movable deviceA- an operating device tor moving it, an hydraulic operating connection between said movable deviceand said first-named pilot valve, ii'uid pressure means for said operating device controlled by said second-named pilot valve, a tollen# up connection for said secondfnamed pilot valve, and hydraulic means connecting the operating device to said follow-up connection. f

8. The combination With an elastic fluid turbine having a valve means controlling the flow of elastic lluid to it and a. valve means controlling the flow at an intermediate point in the turbine, of fluidactuated motors each including a pilot valve for moving said valve means, tvvo movabler devices, hydraulic means connecting said movable devices to said pilot valves, two operating devices each adapted to move said movable devices, means controlled by the speed of the turbine for ellecting movement of one of said operating devices, and means responsive to another operating condition of the turbine for effecting movement ot the kother ot said operating devices. i

9. The combination With an elastic fluid turbine having a valve means controlling` the ilovv of elastic fluid to Iit and a valve means controlling the lloiv at an intermediate point in the turbine, of lnidctuatcd motors each including a pilot valve for moving said valve means, two movable devices, hydraulic means connecting` said movable devices to said pilot valves, an operating device which moves said movable devices in the same direction, an

operatingdevice which moves said movable devices in opposite directions, means controlled by the speed of the turoine ttor cllec` l0. The combination With an elastic lluid turbine having a conduit connected to an inactuated motors including pilot valves for f actuating said valve means, ot a unitary structure comprising two movable devices, an operating device for moving them in the same direction, and an operating device tor moving them in opposite directions, motiontransmitting means connecting said movable devices to said pilot valves.` means controlled by the speed of the turbine for ellecting movement of the first-named operating device, and means responsive to the pressure in said conduit for effecting movement of said secondnamed operating` device.

ll. The combination With an elastic fluid turbine having a conduit connected to an intermediate stage, valve means controlling the admission of elastic fluid to the turbine, valve means controlling the yiiovv of elastic fluid at said intermediate stage, and Huidactuated motors including pilot valves `for actuating said valve means, of a unitary structure comprising a lever, a fulcrum tor the lever, tvvo movable devices connected to the lever, an operating device for moving the ulcrum of the lever, and an operating device for turning the lever on its ulcrum, motiontransmitting means connecting said movable devices to said pilot valves, means controlled by the speed ot the turbine eecting movement of one of said operating devices, and means responsive to the pressure in said conduit for effecting movement of the other of said operating devices.

12. The combination with an elastic fluid turbine having valve means controlliafigYthel admission of elastic fluid to the turbine and valve means controlling the tlovv of elastic fluid at an intermediate point in the turbine, of a unitary structure for controlling said valve means comprising tWo movable devices, a lever to which they are connected, an adjustableA tulcrum for the lever, and operating devices for eilecting movements of said lever, motion transmitting means whereby said movable devices operate said valve means, and means toretlccting mov#- ments of said operating devices in response to operating conditions of the turbines.

In Witness whereof, l have hereunto set my hand this 21st day of April 1926.

nnoruiinn e. sraunnawicn. 

